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+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2004-2008 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#define __STDC_LIMIT_MACROS
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <mach/mach.h>
+
+#include "dyld2.h"
+#include "dyldSyscallInterface.h"
+#include "MachOAnalyzer.h"
+#include "Tracing.h"
+
+// from libc.a
+extern "C" void mach_init();
+extern "C" void __guard_setup(const char* apple[]);
+
+
+// from dyld_debugger.cpp
+extern void syncProcessInfo();
+
+const dyld::SyscallHelpers* gSyscallHelpers = NULL;
+
+
+//
+// Code to bootstrap dyld into a runnable state
+//
+//
+
+namespace dyldbootstrap {
+
+
+// currently dyld has no initializers, but if some come back, set this to non-zero
+#define DYLD_INITIALIZER_SUPPORT 0
+
+
+#if DYLD_INITIALIZER_SUPPORT
+
+typedef void (*Initializer)(int argc, const char* argv[], const char* envp[], const char* apple[]);
+
+extern const Initializer inits_start __asm("section$start$__DATA$__mod_init_func");
+extern const Initializer inits_end __asm("section$end$__DATA$__mod_init_func");
+
+//
+// For a regular executable, the crt code calls dyld to run the executables initializers.
+// For a static executable, crt directly runs the initializers.
+// dyld (should be static) but is a dynamic executable and needs this hack to run its own initializers.
+// We pass argc, argv, etc in case libc.a uses those arguments
+//
+static void runDyldInitializers(int argc, const char* argv[], const char* envp[], const char* apple[])
+{
+ for (const Initializer* p = &inits_start; p < &inits_end; ++p) {
+ (*p)(argc, argv, envp, apple);
+ }
+}
+#endif // DYLD_INITIALIZER_SUPPORT
+
+
+//
+// On disk, all pointers in dyld's DATA segment are chained together.
+// They need to be fixed up to be real pointers to run.
+//
+static void rebaseDyld(const dyld3::MachOLoaded* dyldMH)
+{
+ // walk all fixups chains and rebase dyld
+ const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)dyldMH;
+ assert(ma->hasChainedFixups());
+ uintptr_t slide = (long)ma; // all fixup chain based images have a base address of zero, so slide == load address
+ __block Diagnostics diag;
+ ma->withChainStarts(diag, 0, ^(const dyld_chained_starts_in_image* starts) {
+ ma->fixupAllChainedFixups(diag, starts, slide, dyld3::Array<const void*>(), nullptr);
+ });
+ diag.assertNoError();
+
+ // now that rebasing done, initialize mach/syscall layer
+ mach_init();
+
+ // <rdar://47805386> mark __DATA_CONST segment in dyld as read-only (once fixups are done)
+ ma->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool& stop) {
+ if ( info.readOnlyData ) {
+ ::mprotect(((uint8_t*)(dyldMH))+info.vmAddr, (size_t)info.vmSize, VM_PROT_READ);
+ }
+ });
+}
+
+
+
+//
+// This is code to bootstrap dyld. This work in normally done for a program by dyld and crt.
+// In dyld we have to do this manually.
+//
+uintptr_t start(const dyld3::MachOLoaded* appsMachHeader, int argc, const char* argv[],
+ const dyld3::MachOLoaded* dyldsMachHeader, uintptr_t* startGlue)
+{
+
+ // Emit kdebug tracepoint to indicate dyld bootstrap has started <rdar://46878536>
+ dyld3::kdebug_trace_dyld_marker(DBG_DYLD_TIMING_BOOTSTRAP_START, 0, 0, 0, 0);
+
+ // if kernel had to slide dyld, we need to fix up load sensitive locations
+ // we have to do this before using any global variables
+ rebaseDyld(dyldsMachHeader);
+
+ // kernel sets up env pointer to be just past end of agv array
+ const char** envp = &argv[argc+1];
+
+ // kernel sets up apple pointer to be just past end of envp array
+ const char** apple = envp;
+ while(*apple != NULL) { ++apple; }
+ ++apple;
+
+ // set up random value for stack canary
+ __guard_setup(apple);
+
+#if DYLD_INITIALIZER_SUPPORT
+ // run all C++ initializers inside dyld
+ runDyldInitializers(argc, argv, envp, apple);
+#endif
+
+ // now that we are done bootstrapping dyld, call dyld's main
+ uintptr_t appsSlide = appsMachHeader->getSlide();
+ return dyld::_main((macho_header*)appsMachHeader, appsSlide, argc, argv, envp, apple, startGlue);
+}
+
+
+#if TARGET_OS_SIMULATOR
+
+extern "C" uintptr_t start_sim(int argc, const char* argv[], const char* envp[], const char* apple[],
+ const dyld3::MachOLoaded* mainExecutableMH, const dyld3::MachOLoaded* dyldMH, uintptr_t dyldSlide,
+ const dyld::SyscallHelpers*, uintptr_t* startGlue);
+
+
+uintptr_t start_sim(int argc, const char* argv[], const char* envp[], const char* apple[],
+ const dyld3::MachOLoaded* mainExecutableMH, const dyld3::MachOLoaded* dyldSimMH, uintptr_t dyldSlide,
+ const dyld::SyscallHelpers* sc, uintptr_t* startGlue)
+{
+ // save table of syscall pointers
+ gSyscallHelpers = sc;
+
+ // dyld_sim uses chained rebases, so it always need to be fixed up
+ rebaseDyld(dyldSimMH);
+
+ // set up random value for stack canary
+ __guard_setup(apple);
+
+ // setup gProcessInfo to point to host dyld's struct
+ dyld::gProcessInfo = (struct dyld_all_image_infos*)(sc->getProcessInfo());
+ syncProcessInfo();
+
+ // now that we are done bootstrapping dyld, call dyld's main
+ uintptr_t appsSlide = mainExecutableMH->getSlide();
+ return dyld::_main((macho_header*)mainExecutableMH, appsSlide, argc, argv, envp, apple, startGlue);
+}
+#endif
+
+
+} // end of namespace
+
+
+
+